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        <ol>
<li><p>（必考） 说说盒模型。</p>
<ul>
<li>举例：<br>content-box: width == 内容区宽度 border-box: width == 内容区宽度 + padding 宽度 + border 宽度 （不管 IE *{box-sizing: border-box;}）</li>
</ul>
</li>
<li><p>css reset 和 normalize.css 有什么区别？</p>
<ul>
<li>考英文：<ul>
<li>reset 重置，之前的样式我不要，a{color: red;}，抛弃默认样式</li>
<li>normalize 让所有浏览器的标签都跟<strong>标准规定的默认样式一致</strong>，各浏览器上的标签默认样式基本统一。</li>
</ul>
</li>
</ul>
</li>
<li><p>（必考）如何居中？</p>
<ul>
<li><p>平时总结：</p>
<ul>
<li><p>水平居中：</p>
<ul>
<li><p>内联：爸爸身上写 text-align:center;</p>
</li>
<li><p>块级：margin-left: auto; margin-right: auto;</p>
<blockquote>
<p>margin-left:auto;margin-right:auto;和margin:0 auto;的区别</p>
<p><a href="http://www.imooc.com/qadetail/93736" target="_blank" rel="noopener">避免前面的元素的样式被后面的元素样式所覆盖</a></p>
</blockquote>
</li>
</ul>
</li>
<li><p>垂直居中：</p>
<ul>
<li><a href="https://jscode.me/t/topic/1936" target="_blank" rel="noopener">七种方式实现垂直居中</a></li>
<li><a href="https://blog.csdn.net/wolinxuebin/article/details/7615098" target="_blank" rel="noopener">CSS 元素垂直居中的 6种方法</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><p>选择器优先级如何确定？</p>
<ol>
<li>选择器越具体，优先级越高。 #xxx 大于 .yyy</li>
<li>同样优先级，写在后面的覆盖前面的。</li>
<li>color: red !important; 优先级最高。</li>
</ol>
</li>
<li><p>BFC 是什么？</p>
<ul>
<li>举例：<ul>
<li>overflow:hidden 清除浮动。（方方总是用 .clearfix 清除浮动，坚决不用 overflow:hidden 清除浮动）</li>
<li>overflow:hidden 取消父子 margin 合并。<a href="http://jsbin.com/conulod/1/edit?html,css,js,output" target="_blank" rel="noopener">http://jsbin.com/conulod/1/edit?html,css,js,output4</a> （方方用 padding-top: 1px;）</li>
</ul>
</li>
</ul>
</li>
<li><p>如何清除浮动？</p>
<ol>
<li><p>overflow: hidden （方方反对）</p>
</li>
<li><p>.clearfix 清除浮动写在爸爸身上</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">.clearfix::after&#123;</span><br><span class="line">    content: &apos;&apos;; display: block; clear:both;</span><br><span class="line">&#125;</span><br><span class="line">.clearfix&#123;</span><br><span class="line">    zoom: 1; /* IE 兼容 */</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
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